<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.10/vue.js"></script>
</head>
<body>
<div id="app">
    <div v-for="(item,index) in num">
        {{item}} -- {{index}}
    </div>
</div>
<script>
    const vm = new Vue({
        el:"#app",
        data(){
            return{
                num:7
            }
        }
    })
</script>
</body>
</html>